It's a lengthy process. One problem with "modern" Americans is impatience. Too many are enamored with "instant gratification".
Last year was the 200th anniversary of the end of the War of 1812. When kids are taught history they read about the events leading up to the revolution, the Revolution, the aftermath including writing and ratifying the Constitution, Louis & Clark, and the War of 1812. Most can read it in their texts in a few hours.
I remember the Bicentennial. Ford was President in 1976. I was a junior in college. Last year I was 59. 1976 to 2015 was a lifetime. It was no different for our Founders. Those young men and women who fought in the Revolution were old grandparents when the War of 1812 was fought. Change took time then and it takes time now. It's a constant push and most of us will never see the fruits of our labors.
An ancient Greek proverb is
'Society grows great when old men plant trees whose shade they know they shall never sit in.'
A quote from "Galaxy Quest" is
"Never give up, never surrender!"
Both work for me.